<template>
	<view>
    <view class="search-box">
      <uni-search-bar 
        :radius="100" 
        @input="input" 
        cancelButton="none">
      </uni-search-bar>
    </view>
    <!-- 搜索建议列表 -->
    <view class="sugg-list" v-if="searchResults.length !==0">
      <view 
        class="sugg-item" 
        v-for="(item, i) in searchResults" 
        :key="i"
        @click="gotoDetail(item)">
        <view class="goods-name">
          {{item.goods_name}}</view>
        <uni-icons 
          type="arrowright" 
          size="16">
        </uni-icons>
      </view>
    </view>    
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
      <!-- 标题区域 -->
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="17" @click="clean"></uni-icons>        
      </view>
      <!-- 列表区域 -->
      <view class="history-list">
        <uni-tag 
          :text="item" 
          v-for="(item, i) in historys" 
          :key="i"
          @click="gotoGoodsList(item)">
        </uni-tag>
      </view>
    </view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				timer: null,
        kw: '',
        // 搜索结果列表
        searchResults: [],
        // 搜索关键词的历史记录
        historyList: []
			};
		},
    onLoad(){
      this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
    },
    computed: {
      historys() {
        return [...this.historyList].reverse()
      }
    },
    methods: {
      // input 输入事件的处理函数
      input(e){
        // console.log(e.value)
        clearTimeout(this.timer)
        this.timer = setTimeout(() => {
          this.kw = e.value
          this.getSearchList()
        }, 500)
      },
      async getSearchList(){
        if(this.kw === ''){
          this.searchResults = []
          return
        }
        const {data: res} = 
          await uni.$http.
          get('/api/public/v1/goods/qsearch', 
            {query: this.kw})
        if(res.meta.status !== 200) 
          return uni.$showMsg()
        this.searchResults = res.message
        this.saveSearchHistory()
      },
      gotoDetail(item){
        console.log(item.goods_id)
        uni.navigateTo({
          url: '/subpkg/goods_detail/goods_detail?goods_id='
          +item.goods_id
        })
      },
      saveSearchHistory(){
        // this.historyList.push(this.kw)
        const set = new Set(this.historyList)
        set.delete(this.kw)
        set.add(this.kw)
        console.log(set)
        this.historyList = Array.from(set)
        
        //对搜索历史数据, 进行持久化的存储
        uni.setStorageSync('kw', JSON.stringify(this.historyList))
      },
      clean(){
        this.historyList = []
        uni.setStorageSync('kw', '')
      },
      gotoGoodsList(kw){
        uni.navigateTo({
          url: '/subpkg/goods_list/goods_list?query=' + kw
        })
      }
    }
	}
</script>

<style lang="scss">
  .search-box{
      position: sticky;
      top: 0;
      z-index: 999;
  }
  .sugg-list{
    font-size: 12px;
    padding: 0 5px;
    .sugg-item{
      padding: 13px 0;
      border-bottom: 1px solid #efefef;
      display: flex;
      align-items: center;
      justify-content: space-between;
      .goods-name{
        // 文字不允许换行
        white-space: nowrap;
        // 超出部分隐藏
        overflow: hidden;
        // 文本溢出后, 使用...代替
        text-overflow: ellipsis;
        margin-right: 3px;
      }
    }
  },
  .history-box{
    padding: 0 5px;
    .history-title{
      display: flex;
      justify-content: space-between;
      height: 40px;
      align-items: center;
      font-size: 13px;
      border-bottom: 1px solid #efefef;
    }
    .history-list{
      display: flex;
      flex-wrap: wrap;      
      .uni-tag {
        margin-top: 5px;
        margin-right: 5px;
      }
    }
  }
</style>
